<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>test</title>
</head>
    <script src="https://code.jquery.com/jquery-3.0.0.min.js"></script>
<body>
姓名:<input type="text" name="name"  class="name" onblur="test()" id="name"/><br/>
年龄:<input type="text" name="age"  id="age"/><br/>
<select class="selectors" id="selectors" style="display: none" onblur="test2()">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="opel">Opel</option>
    <option value="audi">Audi</option>
</select>
<select class="selectors3" id="selectors3" style="display: none">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="opel">Opel</option>
    <option value="audi">Audi</option>
</select>
</body>
<script>
   function test() {
       var name=document.getElementById("name").value;
       var names=$("#name").val();
       if(names=="1"){
           $("#selectors").show();
       }
   }
   function test2() {
        var select22=$("#selectors").val();
        if(select22=="opel"){
            $("#selectors3").show();
        }
   }
</script>
</html>
